Thou shalt not kill.
Don’t drink and drive.
He who smelt it dealt it.
These are all LAWS.
Don’t know what they are?
Laws are rules and customs that society agrees to abide by for the common good.
You might be saying, “But, Dave T, I live in a post-apocalyptic anarchic society where there are no rules.”
To you I say, “When you jump in the air, do you land again?”